Caisson.



0. G. EDWARDS, JR.

' CAISSON.

APPLICATION FILED DEO, 13, 1906.

1,014,626. I Patented Jan. 9, 1912.v

1o SHEETS-SHEET wil/nenes t l I l coLUMmA PLANOGRAPH C0.. wAsl-llNnToN. D. c.,

O. G. EDWARDS, JR.

GAISSON.

APPLICATION FILED DB0. 1a, 1906.

Patented Jan. 9, 1912.

10 SHEETS-SHEET 3.

coLuMmA PLANQGRAPH co.,wAsHlNu1-0N, n. c.

0. C. EDWARDS, JR.-

CAISSON.

APPLICATION FLBD D Bc. 13, 1906.'

Patented J all. 9, 1912.

10 SHEETS-SHEET 4.

coLuMBxA PMNOGRAPH c0..wAsH|NGToN. D, c.

0. c. EDWARDS, JR.

CAISSON.

APPLICATION FILED DBO. 13, 1906.

Patented J an. 9, 1912.

10 SHEETSTSHEET 5.

Snowdon @imm/TM 53M v o. o. EDWARDS,'JE.

CAISSON.

APPLICATION FILED DBG. 13, 1906.

Patented Jan. 9, 1912.

10 SHEETS-SHEET 6.

6 V l 6,? gig /47. I :Tg4 t COLUMBIA PLANDGRAMI co.. wAsulNn'roN. l). C.

0. C. EDWARDS, Jim

CAISSON.

APPLICATION FILED 11110.13. 1906.

witwassen 8 1.1 9 Wdmmws coLulnmA PLANUGIMPH co.. wAsmNnTnN. n. C.

8 7 heal/W /67 0. C. EDWARDS, JR. CAISSON.

APPLICATION FILED DEG.13,1906.

Paterted Jan. 9, 1912.

10 SHEETS-SHEET 9.

0. C. EDWARDS, JR. CAISSON.

I ABPLIOATION FILED M1013, 190s' Patented .121119, 1912.

10 SHEETS-SHEET 10.

OLIVER CROMWELL EDWARDS, JR., Q1? TROY,

NEW YORK.

CAISSON.

Specicaton of Letters Patent.

Patented J an. 9, 1912.

Application filed December 13, 1906. Serial No. 347,687.

To all whom t may concern Be it known that I, OLIVER C. EDWARDS, Jr., C. E., a citizen o'f the United States, residing at Troy, in the county of Rensselaer and State of New York, have invented certain new and useful Improvements in Gais-- sons; and I do hereby declarev the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in caissons. and more particularly to caissons designed to be constructed largely or entirely of concrete.

The object in view is the production ofa caisson whose design is such as to attain a maximum strength with a minimum amount of material and at a minimum expense.

lVith this and further objects in view the invention comprises the combination of a caisson inclosure and an arched brace eX- tending across said inclosure and positioned for strengthening the walls of the inclosure.

The invent-on also comprises certain other novel constructions, combinations and arrangement of parts as will be hereinafter more fully described and claimed.

In the accompanying drawings z-Figure 1 is a top plan view of a caisson incorporating one embodiment of the present invention. Fig. 2 is a longitudinal, vertical, central section taken therethrough on the plane indicated by line 2, 2 of Fig. 1. Fig. 3 is a transverse, vertical, central section taken on the plane indicated by line 3, 3 of Figs. 1 and 2.` Fig. 4 is a detail view in side elevation of one of the detachable` metallic knee' braces, the parts being shown on an enlarged scale. Fig. 'is a view in front elevation thereof. Fig. 6 is a fragmentary detail plan view showing two of the retaining bolts in section. Fig. 7 is a transverse, vertical section through a metallic reinforcement for one of the cutting edges. Fig. 8 is a fragmentary view in side elevation thereof. Fig. 9 is an enlarged view of a portion of a wall of the working chamber of the caissony illustrating in detail `the coat-ing employed for preventing, leakage of compressed air. Fig. 10 is a horizontal section through a fragment of the roof of the caisson showing one of the air shafts in section and the supports therefor in'elevation. Fig. 11 is a vertical section taken on the plane indicatedpby line 11, 11

detail fragmentaryof Fig. 10, parts being seen in elevation. Fig. 12 is a top plan view of a slightly modified form of caisson. Fig. 13 is a longitudinal, vertical, central section taken therethrough on the plane indicated by line 13, 13 of Figs. 12 and 14. Fig. 14 is a transverse, vertical, central section taken on the plane indicated by line 14, 14 of Figs. 12 and 13. Fig. 15 is a transverse, vertical, central section through a caisson embodying the elements disclosed in Figs. 12 to 14 inclusive, but with the upright walls illustrated as inclined. Fig. 16 is a similar view of a further modification showing the upright walls of the working chamber vertical, and the coifer dam walls inclined. Fig. 17 is a top plan view of a further modified form of caisson. Fig. 18 is a longitudinal, vertical, central section taken on the plane indicated by line 18, 18 of Figs. 17 and 19. Fig. 19 is a transverse, vertical, central section taken on the plane indicated by line 19, 19 of Figs. 17 and 18. Fig. 20Ais a top plan view of a further modified form of caisson. Fig. 21 is a longitudinal, vertical, central section taken on the plane indicated by line 21, 21 of Fig. 20. Fig. 22 is a transverse, vertical, central section taken on the plane indicated by line 22, 22 of Figs. 20 and 21. Fig. 23 is a transverse, vertical, section taken on the planeindicated by line 23, 23 of Figs. 2O and 21, and looking in the direction indicated by the arrow. Fig. 24 is a longitudinal, vertical, central section taken through a further modified form of caisson. Fig. 25

is a transverse, vertical, cent-ral section taken on the plane indicated by line 25, 25 of Fig. 24. Fig. 26 is a top plan view of a further modiiied form of caisson. Fig. 27 is a longitudinal, vertical, central section taken on the plane indicated by line 27, 27 of Figs. 26, 28 and 29. Fig. 27a is a similar view of a slightly modified form of structure. Fig. 28 is a transverse, vertical, central section taken on the plane indicated by line 28, 28 of Figs. -26 and 27. Fig. 29 is a transverse, vertical section taken on the plane indicated by line 29, 29 of Figs. 26 and 27, and looking in the direction indicated by the arrow. Fig. 30 is a top plan view of a further modified form of caisson. Fig. 31 is a longitudinal, vertical, section taken on the plane indicated by line 31, 31 of Fig. 30, and looking in the direction indicated by the arrow. Fig. 32 is a transverse, vertical,

central section taken on the plane indicated 37 of Fig.

by line 32, 32 of Figs. 30 and 31. Fig. 33 is a transverse, vertical section taken on the plane indicated by line 33, 33 of Figs. 30 and 31, and looking in the direction indicated by the arrow. Fig. 33a is an enlarged detail vertical section through a fragment of the roof and one of the transverse, working chamber trusses. Fig. 34 is a top plan view of a further modified form of caisson of polysided conformation. Fig. 35 is an enlarged,detail, horizontal section through a fragment of one of the corners produced by the juncture of two of the vertical walls of the caisson seen in Fig. 34. Fig. 36 is a 'view in side elevation of the structure seen in Fig. 35. Fig. 37 is a vertical, central section taken on the plane indicated by line 37,

34, looking in the direction indicated by the arrow. Fig. 38 is a vertical, central section taken on the plane indicated by line 38, 38 of Figs. 34 and 37, looking in the direction indicated by the arrow. Fig. 39 is a vertical section taken on the plane indicated by line 39, 39 of Fig. 34, and looking in the direction indicated by the arrow. Fig. 40 is a top plan view of a further modi` fied form of caisson. Fig. 41 is a longitudinal, vertical section taken on the plane indicated by line 41, 41 of Fig. 40, and looking in the direction indicated by the arrow. Fig. 42 is a longitudinal, vertical section taken on the plane indicated by line 42, 42 of Fig. 40, looking in the direction indicated by the arrow. Fig. 43 is a transverse, vertical section taken on the plane indicated by line 43, 43 of Figs. 40, 41 and 42, and looking in the direction indicated by the arrow. Fig. 44 is a transverse, vertical section taken on the plane indicated by line 44, 44 of Figs. 40, 41 and 42, and looking in the direction indicated by the arrow. Fig. 45 is a top plan view of a further modified form of caisson. Fig. 46 is a longitudinal, vertical, central section taken on the plane indicated by line 46, 46 of Fig. 45. Fig. 47 is a transverse, vertical, central section taken on the plane indicated by line 47, 47 of Figs. 45 and 46. Fig. y48 is a transverse, vertical section taken on the plane indicated by line 48, 48 of Fig. 45, and looking in the direction indicated by the arrow, the parts being seen on an enlarged scale. Fig. 49 is a top plan view of a further modified form of caisson. Fig. 50 is a longitudinal, vertical section therethrough taken on the plane indicated by line 50, 50 of Fig. 49, and looking in the `direction indicated by the arrow. Fig. 51

is a transverse, vertical, central section taken on the plane indicated by line 51, 5l of Figs. 49 and 50. Fig. 52 is a similar section taken on the plane indicated by line 52, 52 of Figs. 49 and 50 and looking inthei direction indicated by the arrow. Fig. 53 is a top plan view of a further modified form of caisson. Fig. 54 is a vertical section taken on thev plane indicated by line 54, 54 of Fig. 53, and looking in the direction indicated by the arrow. Fig. 55 is a vertical section taken on the plane indicated by line 55, 55 of Fig. 53, and looking in the direction indicated by the arrow. Fig. 56 is a top plan view of a further modied form of caisson. Fig. 57 is a vertical, central section taken on the plane indicated by line 57, 57 of Fig. 56. Fig. 58 is an enlarged, detail, horizontal section of a fragment ofthe wall of the caisson seen in Figs. 56 and 57. Fig. 59 is a vertical section taken on the plane indicated by line 59, 59 of Figs. 56 and 57, and looking 1n the direction indicated by the arrow, thel vertical wall being omitted. Fig. 60 is a horizontal detail section taken on the plane indicated by line 60, 60 and looking downwardly, parts being seen on an enlarged scale. Fig. 61 is a similar view of the same parts, the concrete being illustrated in dotted lines and the reinforcement therefor being seen in full lines. Fig. 62 is a horizontal section taken on the planes indicated by lines 62, 62-of Fig. 57 and looking downwardly, the concrete being omitted. `Fig. 63 is a detail plan view of the cutting edge reinforcement for the side wall at one of the corners showing the structure of the reinforcement of one of the arch ties. Fig. 64 is a vertical section taken on the plane indicated by lines 64, 64 ofFig.' 63. Fig. 65 is a detail view in side elevation of the reinforcement of one of the arch` ties, the wall cutting edge reinforcement being shown in section. Fig. 66 is a detail view in top plan of the inclosing wall cutting edge reinforcement. Fig. 67 is a vertical section therethrough taken on the plane indicated by line 67, 67 of Fig. 66.

The present invention comprehends the employment in combination with a caisson of an arched brace arranged in the interior thereof, and connected at its ends with the wallsl of the caisson. The same general conception directed more particularly to arched braces arranged parallel to and formed integral with the walls throughout their length, and other arched braces generically have been covered by the claims in my co-pending application executed by me on the rst day of November, 1906, Serial No. 347,686, and I desire the claims herein not to be construed to cover the features of construction claimed in the said co-pending application.

In Figs. l to 3 .inclusive I have illustrated an embodiment of thepresent invention in which 1, l indicates side walls, and 2, 2 end walls which are formed inte al and provided with an integral roof 3 'dividing the inclosure into a working chamber below and a coffer dam above. The side walls 41, 1 of the coifer dam are 'strengthenedy and braced by transverse longitudinally arranged trusses, each extending from one of the end walls to the other end wall and formed integral with the end walls, each truss being spaced from the side wall. Each of the said longitudibracing trusses, each consisting of an arch 4 extending from one side to the other and having its ends tied together, by the roof 3. The upper edge of each arch 4, at the point of union with the respective wall 1, is provided with a knee brace 5 formed integral' with said wall and arch. Each arch 4 is also strengthened by a vertical post 6 extending from the roof 3 up to and formed integral with the softit of the arch at the point of the crown.

The end walls 2 are connected by longitudinal braces extending throughout the length of the cofer dam, and each consists of a plurality of arches 7 arranged end to end and formed integral with each other and with the end walls. Each of the arches 7 has its ends tied together by the roof 3,

ranged end to end and formed integral with each other, and having their ends tied together by a longitudinal chord 17 similar in construction and arrangement to eac chord 13. Each of the arches 16 has its crown formed by a part of the roof 3, and is connected at the point of its crown with tends from the chord 17 tothe sofiit of the arch. Spaced are osts 19, 19 connectingthe chord 17 with the soflit of the respective arch 16, as

nal trusses consists of arches 16, 16 ar-l the chord 17 by a vertical post 18, which exat each side of the post 18* and is further strengthened by a central, many posts 19 being used as are desired. vertical post 8, which extends from the roof The side wall of the working chamber is to the soffit of the respective arch at the connected with the roof by knee braces 11, crown thereof. Spaced at each side of the and the endwalls are connected by similar post 8 are similar posts 9, 9. The arches 7 knee braces 11. intersect the arches 4, and extend above the It is obvious, of course, that the illustrasaid arches, all'of said arches being formed tion in Figs. 1 to 3 inclusive is on a reduced 90v integral at the points of intersection. At scale and therefore, I have not shown the each point of intersection of the arch 4 with detail features of construction therein, but. the arches 7, the respective arch 4 is conhave shown such details on an enlarged nected with the arches 7 by knee braces 10, scale in Figs. 4 to 11 inclusive. 10 formed integral with the arches. As ln Figs. 4to 6 inclusive,lhave illustrated 95y illustrated, the arches 4 intersect the arches one of the knee braces 11 in detail, and from 7 at the points' of the meeting ends of the said figures it will be obvious that each of middle arch 7 with the end arches 7, but it said knee braces consists of a triangular we is of course obvious that if the caissonwere 20 to which is bolted angle bars 21, 21. One made of different size so that a different of the legs of each angle bar is riveted or number of arches 7 were employed, or a otherwise suitably secured to the web 20, different number of arches 4 were emthe other web of the respective angle bar ployed, the points of intersection would be projecting laterally from the web 20y and altered correspondingly. Each of the side producing a flat bearing surface. As illuswalls 1 is connected with the roof 3 by knee trated, the web 20 is in the form of a right 105 braces 11, and each of the end walls 2 is angle triangle but of course mav assume any connected to the roof 3 by a similar knee shape necessary to conform tothe angle of brace 11. Each of the knee braces 11 is the meeting walls, which are to be braced. constructed in detail as shown in Figs. 4, The legs of the angle bars 21 which form 5 and 6, and hereinafter fully described. flat surfaces arranged to bear against the 110 The working chamber is provided with a walls to be braced are provided with a suitpair of transverse bracing trusses, each able number of perforations through which consisting of an arch 12 having its ends tied are passed bolts 22, 22, each of said bolts together by a transverse chord 13, each having at one end an anchoring washer 23 chord 13 being beveled to form a cutting retained in place by a nut 24. The opposite 115 edge, and being formed with a metallic reend of each bolt is provided with a threaded inforcement 14, seen in rdetail in Figs. 7 nut 25. In practice, the knee brace 11, as and 8, and hereinafter fully described.y seen in Fig. 4, is placed for instance in the The side and end walls are beveled at their angle formed by the juncture of the roof 3 lower edges for producing a cutting edge with one of the side or end walls, and the and are provided with cutting edge reinbolts 22 are embedded in the respective side forcing means 14, somewhat similar to the or end wall and in the roof. After the conchord metallic. reinforcements. Each of the crete has set, the nuts 25 are tightened for arches 12 has its crown formed by a part of taking up any slack. The horizontal leg of the roof 3, and the chord 13 for each arch each brace used in the working chamber is 125 12 is connected with the arch centrally of provided with a plurality of slots 26, one its length by a vertical post 15, whichV exfor each bolt 22, and in practice tends from the chord to the soit of the each of said slots is filled by a removable arch at the crown thereof. The working plug or filling 27 of any suitable type. chamber is also provided with a pair of When it is desired to fillthe working cham- 139 sof ber with concrete, the sinking of the caisson having been completed, the nuts 25 areremoved and each of the knee braces 11 is moved inwardly, the slots 26 permitting such inward movement, the plugs 27 of course having been removed, and after the respective knee brace has been moved inwardly to a sufficient dist-ance for being free of the inner ends of the horizontal bolts 22, the knee brace is lowered out of engagement with the vertical bolts 22. Thus the knee brace may be used repeatedly. When used in the working chamber the horizontal leg is provided with the slots 26, as the greatest strain coming on the knee brace will be due to the coifer dam filling,

and will be downward and therefore a solid metal bearing on the horizontal bolts 22 is desirable. When the knee brace is used in the coifer dam, the greatest strain is horizontal, owing inward pressure of the surrounding earth and water on the coffer dam walls, and therefore the leg of the knee brace which is provided with the slots 26 is arranged vertically in the coffer dam so that there will be a solid metal bearing for the nuts of the vertical bolts 22 of the coffer dam knee braces 11.

In Figs. 7 and 8, I have illustrated a form of metallic reinforcement, which is the preferred construction of the reinforcement seen at 14. The said metallic reinforcement consists of a metallic truss having a top chord composed of angles 28, 28, a bottom chord composed of angles 29, 29 and lacing bars or inclined web members 30, 30, connecting the top and -bottom chords. A channel iron 31 is riveted to the bottom chord and acts as a cutting edge, and also gives additional tensile strength to the contiguous parts of concrete. Ordinarily the bottom chord, in operation, will be in tension, and the top chord in compression, but when the caisson is being sunk, a considerable upward pressure may be exerted upon the cutting edge while cutting through the earth, and the top chord of the reinforcing truss will then be in tension and the bottom chord in compression. Hence, the desirability of a strong top chord. Attached to the metallic reinforcement in any suitable manner are shown metallic rods 32, 32 and 35, 35 which are used for providing the necessary tensile strength for vertical and inclined posts respectively, connecting the arch chord with the sofrit of the arch; and a further means of attaching reinforcement rods, as 34, is illustrated, by the angle irons 33 suitably fastened to t-he metallic reinorcement. Figs. 7 and 8 indicate the metallic reinforcements of one of the working chamber transverse struts or chords and one of the working chamber longitudinal struts or chords at they point of intersection thereof, vthe truss which should appear in side to the .7 being shown in dotted lines in order to more clearly disclose the transverse section of the truss seen in side elevation in Fig. 8. Y

It is, of course, well known to those skilled in the present art, that a caisson is sunk while the working chamber is supplied with air under pressure, and in order to supply air under pressure and to permit the removal of spoil and to permit access of operators, the roof is provided with apertures through which are passed spoil and man shafts and other tubes, signal wires and such other devices as are necessary for the carrying out of the work necessary for excavating beneath the caisson.

In Figs. 1, 2 and 3, I have shown openings in the roof for receiving various shafts, and in Figs. 10 and l1, I have illustrated in detail one of the air shafts. In said Figs. 10 and 11, I have shown the air shaft 36 as extending through the roof 3, and being supported in place by suitable clamps 37, 37, having arms 38, 38 extending into the material of the roof. The shaft 36 is surrounded by a coating 39 of asphalt, tar, pitch or other similar substances, which coating forms a close joint with the tube 36 and prevents leakage of air.

In Fig. 9, I have illustrated an enlarged detail section through a portion of the working chamber wall and roof, and in said figure, I have shown the use of a coating 40 of elevation in Fig.

asphalt, tar, pitch or similar substance for' preventing leakage of air. The said coating may be applied in any preferred manner as by the use of a mop, broom or like instrument while the material is in a heated condition. The coatings 39, and 40 are of course applied while in a liquid condition.

In Figs. 12 t0 14 inclusive, I have illustrated a slightly modified form of caisson in which 4l, 41indicat-e suitable side walls, and 42 suitable end walls formed integral with a roof 43 dividing the inclosure produced by said side and end walls into a working chamber below and a coffer dam above. The roof 43 is stiffen'ed and strengthened by continuous knee braces 44 extending about all of the side and end walls 'and formed integral with therespective side and end walls andwith the roof. Within the' coffer dam are arranged'transverse braces, each consisting of an arch 45 extending from one side wall to the other and formed integral at its ends with said side walls, the said arches being spaced apart and spaced from the endwalls. Each of said arches has its ends tied together by. the roof 43. Extending longitudinally of the coffer dam are longitudinal arched trusses spaced apart and-spaced from the side walls andl having their ends formed integral with;- theend walls, each of-said trusses consisting of a number of arches 46; The' ends of the varches 46 are -tied together by the roof 43. At the point of intersection of the transverse trusses Ywith the longitudinal trusses, the said trusses are formed integral with each other. Above the concrete walls 41 and 42 the cofer dam vmay be extended by the use of wooden walls 48 if desired, which may be constructed and braced in any preferred manner, and may be secured in place by bolts embedded in the concrete of the walls 41 and 42. n

The working chamber is provided with a pair of transverse trusses spaced apart and spaced from the end walls and having their ends formed integral with the side walls, each Iof said trusses consisting of a transversely arranged arch 49 vhaving its ends tied together by a transverse-strutor chord 50. Each chord 50 is of greater thickness than the respective arch 49 and .is preferably beveled at its lower edge for forming a cutting edge. The crown of each arch -49 is preferably formed from the roof 43. T he working chamber vis provided with longitudinal trusses spaced apart and spaced from the side walls, and having their ends formed inv tegral with the end walls, each of said trusses consisting of a number of arches 51 arranged end to end and formed integral with each other, and a longitudinal chord 52 tying all of the ends of the arches 51 together. Each chord 52 is of greater thickness than its respective arch 51, and is prefera-bly beveled at its lower edge for producing a cutting edge, and each arch 51, preferably has its crown formed from the roof 43. The chords 52 are preferably tied to-v gether at various points intermediategtheir. length by transverse struts 52', 52', anysuitable nulnber of the struts 52l being employed for stiffening the chords 52 and lpreventing lateral swaying thereof. Each strut 52 is preferably beveled at its -lower edge for producing a cutting edge.

In Fig. 15 I have illustrated a structure corresponding exactly to the structure seen in Figs. 12 to 14 inclusive, Yexcept that the side walls are shown positioned -on an ineline so that the working chamber flares downwardly `and the coffer dam ltapers upwardly. It is obvious, of course, `that the end walls kmay be provided with the same slant so as to' produce a caisson of pyramidal form, whereby the base is given an increased area for forming a firm foundation. The same elements are present in the structure seen in Fig. 15 as are seen in Figs. 12 to 14 inclusive, and therefore the same reference Vnumerals have lbeen used and the same description will apply.

In Fig. 16 I have illustrated a further modified form of caisson,which is constructed the same in every detail as the structure seen in Fig. 15, except that instead of having l(i5 lthe side and end walls slanting for their full height, the working chamber walls are made vertical while lthe coder dam walls vare in-` clined, all the other details being exactly like those described with respect to the structure seen in Figs. 12 to 14 inclusive, and the same reference numerals have therefore been applied and the same description is applicable. The structure yseen in Fig. 16 is superior to the structure seen in Fig. 15 for the reason that in sinking the structure seen in-Fig. 15 `considerable difficulty is experienced in maintaining the caisson in the proper vertical condition, whereas with the structure seen in Fig. 16 the enlarged base is secured'while a certain portion of the upright walls are formed vertical so as to guide l thecaisson in its descent.

In Figs. 17 to 19 inclusive, I have illustrated another modified form of caisson involvingA the usual side walls 54, 54, and end walls 55, 55 formed integral with a roof 56. The roof divides the inclosure yproduced by the side and end walls into a coifer dam above and a working chamber below. The coffer dam is provided with transverse trusses spaced apart and spaced from lthe end walls and formed integral at their ends with the side walls, each of said trusses consisting of arches 57, 57, having their end-s tied together by the roof 56, and having their soffits connected with the roof by webs 58,158, each of which webs extends fromione end of its respective arch to the other. The upper edge of each transverse truss at reach end thereof is provided with a knee brace 59 100 which is formed integral with the respective truss, and also formed integral with the side wall. The coffer dam is also provided with longitudinal trusses spaced apart and spaced from theside walls, each yof said trusses extendingl throughout the length of the ycoier dam and being formed integral at its ends with the end walls. Each of said longitudinal trusses consists of a number of arches 60, arranged end to end and formed integral,each. of said arches having its ends tied together by the roof 56, and having its soffit connected with the roof by a web 61, which extends throughoutthe length of the arch. Each'of the longitudinal trusses, 1s, of course, formed integral with the transverse trusses at the points of intersection, and at said points the longitudinal and transverse trusses are connected by integral knee braces 62, 62, 'the ends of the longitudinal trusses being zprovided with integral knee braces 63, k63 extending from the upper edge of the respective longitudinal 'truss to the upper edge 4of the krespective end wall and formed integral with the fend wall. The working chamber is provided with transverse 'bracing trusses spaced apart and spaced from the end walls, and each having its ends formed integral with the side walls,each of said trusses being constructed of arches 64, 64, Vhaving all 1of lpartment is their endstied together bya transverseistrutY or chord 65, and each having its soliit connected with the chord by a web 66, which eX- tends throughout the length of the respective arch. It will be observedl particularly from Fig. 19 that the middle arch 64 has its crown formed from the roof 56, and the end arches 64 have their crowns formed independently of the roof, the entire truss of course being formed integral with the roof throughout its length. The cofer dam is further provided with longitudinal trusses spaced apart and spaced from the side walls, each of said trusses being formed integral at its ends with` t-he end throughout its length with the roof.-` Each of said longitudinal trusses consists of a series of arches 67, 67 arranged end to end and having their ends tied together by ay longitudinal chord 68, each of the arches 67 having itssoflit connected with the chord 68 by a web 69, which extends throughout the length of the respective chord. The crown of each arch 67 is lpreferably formed from the roof 56. Each of the chords and 68 is preferably beveled at its lower edge for producing a cutting edge. A

It is to be observedthat the presence of the webs 66 and 69 cause the transverse and longitudinal trusses to be in fact bulk heads, which divide the working chamber into nine compartments, and each corner of each comprovided with a trihedral angular filling 71 formed integral with the roof and with the contiguous walls of the compartment and extending from the roof downi -wardly a suflicient distance for strengthencording to the size of the size of the caisson ,4.5

ing' and bracing the respective walls of the compartment. Itwill be obvious of course that each of the said compartments may be made of any dimensions desired, and that the size of the caisson may be altered acthe compartments, or may be enlarged by increasing the number of compartments through an increase in the number of .longitudinal and transverse trusses which constitute bulk heads. It is, of course, obvious that the arches and the webs of each of the trusses are formed integral andtherefore each truss may be considered merely a bulk head strengthened on each side by a truss having an arched upper chord. Of course, posts similar to'posts 18 and 19 may connect chords 65 and 68 with the sottits of the respective arches, if desired.

In Figs. 2O to 23 inclusive, I have illustrated another modified form of caisson in which I employ the usual side walls 71, 71 and end walls 72, 72. A roof 73 is formed integral with the side and end walls, the said side and end walls terminating at the roof and not extending above thesame as in the structures hereinafter described.

Any sultable wooden Colfer dam 74 may be walls, and integral' 'together by a longitudinal chord mounted upon the upper edge of the walls 71 and 72. The wooden cofer dam 74 is stiened by transverse concrete trusses spaced apart and spaced from the ends of the coffer dam, each of which trusses is formed of an arch 75 and a transverse chord 76 tying the ends of the arch together and formed integral with the roof. At each end of thefcofer dam is arranged a transverse truss similar to each of the intermediate trusses, and consisting of a transverse arch 77, the ends of said arch being tied by a transverse chord the roof. Connecting the end trusses are longitudinal trusses spaced apart andspaced from the side walls of the coffer dam 74, each of said longitudinal trusses being formed integral with the end trusses at its ends and integral with the intermediate trusses at the points of intersection. Each of thelongitudinal trusses consists of a series of arches 79 arranged end to end and formed integral with each other, and having all of their ends tied together by a longitudinal chord 80 formed integral with such ends and formed integral with the roof 73. At the point of intersection of each of the longitudinal trusses with the intermediate trusses and at the point of juncture of the ends of each of the longitudinal trusses with the end trusses, the intermediate and end trusses are connected with the longitudinal trusses by knee braces 81, 81. The longitudinal 'trusses 79 are connected at various points intermediate their length by transverse struts 7 9, 7 9, which serve to prevent independent lateral tudinal trusses.

The working' chamber below the roof 7 3 is provided with a transverse centrally disposed truss consisting of an arch 82 having its ends tied together by a transverse strut 'swaying of the longi-V or chord 83, which is suitably reinforced and tapered for producing a cutting edge. The working chamber is further provided with longitudinal trusses spaced apart and spaced from the side walls and formed integral at their ends vwith the end walls, and at their upper edges with the roof throughout' their length. Each of said trusses consists of arches 84, 84 having theirmeeting imposts formed integral, and having their ends tied 85 which is formed with suitable reinforcements and beveled for producing a cutting edge. The inner ends of the arches 84 meet at the point of intersection of the arch 82 and are formed integral therewith. Each of the end walls of the working chamber is paneled out as at 86 producing an arch 87 and a chord 88 tying the ends of the arch 87 together. Each of the side walls is similarly paneled as indicated at 89, but by preference two panels are provided for each side wall,

producing two arches with tie chords similar the intrados of the arches seen in may be saved 'heiress tudinal yarch in Fig. 21. Each corner produced by the junctureof the roof with the side and end walls as well as each corner produced by the juncture of the roof with the intersecting trusses and with the trusses at the points of vjuncture with the side or end walls is filled lwith a trihedral angular filling 90.

It is to be observed that in each of the lstructures illustrated and described above,

except what is disclosed in Figs. 20 to 23 inclusive, the side and end walls are shown as solid and continuous and of substantially the same thickness throughout, but it is of course obvious that paneled walls may -be provided andthe panels may assume vany form desired, various forms of paneling being illustrated in my several co-pending applications for patents, the p articular construction of the side and end walls being claime specifically in my above mentioned copending 1t is 'further to be observed that applications.

Figs. 21 to been formed of a series of The reason or 23 inclusive, has chords of arcsof circles. constructing manner is that in practice wooden forms are usually employed and much timel and labor L by using the lumber in a straight condition instead of bending the same. Of course, if metallic forms are employed the curved intrados will be preferably produced. These remarks are of course applicable to all of the arches disclosed herein.

In Figs. 24 and 25 l have illustrated a further modified construction, a top plan of which would appear the same as Fig. 20 except that the transverse struts 79 are omitted. Paneled side and end walls 91, 91 and 9292 respectively are shown provided an integral roof 93. Mounted upon the upper edge of the walls V91 and 92 is any suitable wooden coifer dam 94 braced by transverse and longitudinal trusses, the transverse trusses being spaced apart and spaced from the end walls of the coffer dam and each being formed of an arch 95, T- shaped in transverse section, and a transverse chord 96 connecting the ends of the arch together. The web 95. of the T of the arch is of course formed integral with the main body portion of the arch and extends throughout the length of the said main body portion, and is preferably provided with knee braces 97, 97 formed integral with said web and with the main lportion of the arch and extending throughout the length of the arch. The longitudinal trusses are spaced apart and spaced from the side walls of the Colfer dam, as clearly seen in Fig. 25,

and each is made up of a series of arches 98 the arches 84 with theirA the respective arch and therewith, and also the intrados of the arch in this end and 'formed integral each of said arches being formed T-shaped in transverse section an having the web 98 of the T extending throughout the length of the main body 0 formed integral connected with said main body by continuous knee braces 99, 99. The arches 98 of each longitudinal truss have their ends tied together by a longitudina arranged end to with each other,

vchord 100, and it will be observed that the chords 96 and 100 are all formed integral with the roof. The ylongitudinal and transverse trusses are, of coursefformed integral with each other at the points of intersection. The working chamber produced by the walls 91 and 92 and the roof 93 is provided witli a central, transverse truss formed integral at its ends with the side walls and its upper edge with the roof, the said truss consisting of an arch, 101 and a chord 102 arranged transversely of the working chamber and tying the ends of the arch 101 together. As clearly seen in Fig. 24 the arch 101 is T-shaped in t-ransverse section, the web 101 of the T being of course formed integral with the main body portion of the arch and -extending throughout the length thereof, the web and main body portion being further connected by knee braces 103, 103 extending throughout the length of the arch. The working chamber is further provided with longitudinal trusses spaced apart and spaced from the side walls, each of said trusses consisting of arches 104, 104 arranged end to end and formed integral, and having their ends tied together by a longitudinal chord 105. Each arch 104 is formed T-shaped in cross section, as indicated in dotted lines in Fig. 25, the web 104 of the T extending throughoutsthe length of the body portion of the arch and being of course formed integral therewith, and being further connected by knee braces 106, 106 extending throughout the length of the arch. At various points intermediate the length of the chords 105,said chords are tied together by transverse struts 106, 106 which are formed integral with the said chords and serve to prevent independent lateral swaying of the chords.

In Figs. 26 to 29 inclusive, l have-illus trated another modied form of caisson especi ally designed for being constructed of large dimensions. he structure seen in Figs. 26 to 29 inclusive involves the usual side walls 107, 107 and end walls 108, 108, provided with the roof 109. A wooden or metallic coffer dam 110 of any preferred type is mounted upon the upper edge of the walls 107 and 108, the walls 107 and 108 extending above the roof 109 only a distance sufficientfor accommodating roof beams and chord members. Within the coifer dam are arranged transverse trusses spaced apart andk said chord being formed integral with the -109 is provided with a longitudinal, central Vwith the chord and the ends of the cofter dam.' transverse tusses consists of spaced from spective arch at the point of its crown. The Each of said working chamber is further provided wit-h which is formed integral the side walls and is conconnected by a transverse chord 112, the nected by a transverse strut /or chord 127 which chord is connected with' the arch by a vertical post 128 extending from the chord to the solit of the arch at the point of its crown. It is to be noted that the chord 127 a cutting edge 129 which lies above the horizontal plane of the cutting edge of the walls 107 and 108, the

chord 124 notJ being provided with a cutting roof and with the ends of the arches. The coffer dam is further provided with longitudinal trusses spaced apart and spaced from the sides of the coifer dam, and eachformed of a plurality of arches 113, 113 arranged end to end and formed integral, and having their ends tied together by a longitudinal chord 114 formed integral with the roof 109 and also integral with the ends of the arches which are connected together. Each of the arches 113 is strengthened by a central post 115 formed integral with the soflit of the arch at the point of the crown and extending to and formed integral with the respective chord 114. the post 115 are similar of the post 115, inclined braces 117 being provided for connecting the chord 114 at the lower end of the post 115 with the soflit of the respective arch at the upper ends of the posts 116. Each of the inclined braces 117 is preferably provided at each end with nee braces arranged on opposite sides of the respective brace and formed integral with the contiguous parts. The longitudinal and transverse trusses are of course formedl integral at the points of intersection and serve to strengthen and stiften the roof 109, and to aid in the distribution of stresses thereon. The roof is further strengthened and stiened by a longitudinal roof beam above the horizontal the cutting edges may cutting edge of the vertical walls.

In sinking a caisson it is often found dea few inches, but usually the advantage to be gained by letting the lower edge of the chords or struts into the bed rock is not comare let into the same.

It is to be observed that the crowns of the arches 123 and 126`a're formed by the roof 109. The advantage to be gained by this construction lies in the fact that a greater rise for the arches is obtained than would be secured if the crowns of the arches were made independently of the of course understood that within certain the stiffer the head room is also given in the working chamber by the arch having its crown formed by the roof.

In Fig. 27 a, I have illust-rated a structure embodying `exactly the same details as seen in Fig. 27, except that the working chamber longitudinal truss has its arches and tie chord connected by posts 125 the central post 125 and also connected by inclined web member braces 125, each of t-he inclined web members being preferably provided at each end with knee braces. As every other detail of the structure is the same as that described with respectto Fig. 27 the same reference numerals have been applied and t-he same description is appli- It is obvious, of course, that any numman-shafts.

The working chamber produced by the 'walls 107 and end length of the truss. The said truss consists gether by a longitudinal chord 124. The chord 124 is connected with each of the arches'123 midway of the length thereof by a vertical post 125 which is formed integral with the soiiit of the reroof, and it is` spaced from structed offan 'arch 126 having its ends conedge and having its lower edge slightly ber ofthe inclined web members may be provided for the transverse trusses of the working chamber, if desired. v A In Figs. 30 to 33 inclusive, I have illustrated a further modied form of caisson'in which arey employed 'the' usual side walls 130, 130, end walls 131, 131y and roof 132, the side walls and roof being formed integral, and the roof serving to divide the inclos'ure produced by the walls into a working chamberbelow and a coifer dam above, the walls of the cofer dam being illustrated as -paneled 'and the working chamber walls being shown solid. Itis, of course, obvious that the working chamber walls may be paneled if desired, and if preferred the coffer dam walls may be solid. The cofer dam is provided with transverse inclined web member trusses 133,133 and with a lonitudinal inclined web member truss 134, the truss 134 being formed integral with the trusses 133' at the points of intersection. The lower chord of each of the trusses 133 and 134 is formed independently of and integral with the roof 132, and the said trusses are formed at their ends integral with the respective walls of the coffer dam. The roof 132 in addition to the longitudinal and transverse trusses is further strengthened by transverse roof beams 135, 135, which are preferably crowned, or in Aother words formed with an arched upper edge as indicated in Figs. 32 and 33. l

.The working chamber is provided with a series of transverse trusses, each consisting of an arch 136 having its ends tied together by a. transverse strut or chord 137. The crown of each of the arches 136 is shown as formed independently of and integral with the roof 132, but ma be otherwise constructed if preferred, and 'the chords 137 which are shown with iat loweredges are suitably reinforced and may be provided with cut-ting edgesif desired. Between the intrados of each arch 136 and the under side of the roof '132 are placed fillings 136 for strengthening purposes, which are formed integral withthe arch, the roof, and the walls 130, and each of whichV extends approximately to the middle of the respective truss. The fillings 136 give the vertical faces of the transverse trusses a curved effect, as seen in dotted lines in Fig. 30, or in other words the vertical faces of the trusses are convex, but it is obvious that the fillings 136 may be provided with flat outer faces which would produce the effect of a flare at each end of the trusses. vious that any of the other trusses may be provided with similar fillings as found desirable.

In Figs. 34 to 39 inclusive, I have illustrated another `modified form of caisson which involves an inclosing wal/l having sides 138, 138 formed integral with-aroof gral 'with Vthe wall. Each rlength by vertical posts,

'with 'The working chamber is provided with together `is curved to conform 4in place by suitable vhaving heads countersunk in the shield and 4It is, of course, ob-

139,' the" cross sectional contour` of the caisson being illustrated as hexagonal, but, of course, the Acaisson may be constructed polysided with a greater or less number of sides without deviating from the spirit and scope ofthe invention or materially affecting the results attained. Thewalls 138 are shown solid, although they may be trussed or panneled if desired. The coer dam is divided into two compartments by a transverse bulk. lhe'ad 140 having chords, the bottom ',arately from and integral with the roof 139. The bulk head connects two of the diamettrically opposite corners of the walls 138 and y,isfintersected by trusses 141, parallel, and each connecting two of enlarged top and bottom chord being formed sep- 141 arranged the corners of the walls 13.8. The trusses 141 and bulk head 140 are formed integral at the points of intersection, and the ends of the said trusses and bulk head are formed inteof the trusses 141 consists of an upper and a lower chord tied together at, points intermediate their the lower chord being.y formed independently of and integral the roof 138.

each set of diametrically each of said trusses consisting of an arch 142 having its ends tied by a chord 143. All of the arches 142, though not necessarily,have their crowns atthe same point, which is at the center of the roof 138, the crowns of all of said arches being formed by the roof. `The chords 143 are of course formed integral at the points of intersection, and each is shown as provided witha suitable metallic reinforcement and beveled for forming a cutting edge, though the cutting edge may be omitted if desired, or it may be raised above the horitrusses connecting opposite corners,

yzontal plane of the wall cutting edge. This form` of caisson is especially adapted for use for foundations of the pivot piers of swinging bridges, for light houses and the like, and of course, as above intimated may be made vfor any cross sectional contour preferred.V When formed with corners as illustrated, I preferably provide a metallic shield 144 for each of the corners, which shield with the curvature of the corners and embedded in the material of the wall, the shield being retained ancho-ring pins or bolts their body portions extending into the concrete of the wall. A fragment of one of the shields is shown in detail in Figs. 35 and 36.

In Figs. 40 to 44 inclusive, I have illus- Vtrated a further modified form of caisson which is provided with the usual side walls f 147,

145, 145, end walls 146, 146 Aand roo the roof dividing the inclosure produced by vvcerned,'constructed in any preferred manseries of inverted arches 149.- The arches 148 have their crowns connectedA with the transverse trusses spaced apart and spaced ing of a pair of arches, 151, having their 1; verse trusses and the longitudinal truss has i' ,i longitudinal and transverse trusses, the roof each side with an integral knee brace 157 aperture 159 for the reception of a man or AL or the lower chord of the transverse truss.

. i ther connected therewith by an integral knee f Eachof the' longitudinal beams 156 atrrthe 150m-gezet thewalls into a working chamber below and a coft'er dam above. The inclosing walls are illustrated as trussed or paneled and may be, as far as the present invention is con- 4point .of intersectionk with each'of the roof beams 155 and with each of the lower chords of the transverse trusses is provided with integral knee braces 163. Each of the longitudinal beams 156 is provided at each'end 7-0 with a similar knee brace 164 formed integral with the respective end wall. The roof 147 is connected with the side and end walls by a continuous knee brace 165.

The working chamber is provided with a. central, longitudinal truss having its ends i formed integral with the end walls, and its upper edge formed integral with vthe roof, ,said truss consisting ,of a series of arches 166 formed integral .with each other and 80` having their ends tied together by lsimilarly constructed inverted arches 167 The arches 166 rand 167 are illustrated as having the span and rise necessary for each to producel `a semi-circle so that the two arches together produce a circle. It is ofcourse obvious that the span or rise or both may be altered vat will. The crowns of the arches 166 are jindicated as formed by the roof 147. The

ner, the trusses of the side walls being seen in Fig. 42 as being of the ordinary inclined web member type, and the trusses of the end walls as indicated in Fig. 44 being of the same type. The coffer dam lis provided with a central, longitudinal truss having its ends formed integral with the end walls and being constructed of a series of arches 148 having their ends tied together by a 148 and 149 are each illustrated as semi-circular, but of course, the span and rise of each arch may be altered as desired according to the results to be attained. The arches crowns of the arches 149 by vertical posts 150, each of said posts being formed integral with the soiiits of its respective arches.

The coifer dam is further provided with from the vend ywalls and formed integral at their ends with the side walls and with the longitudinal truss at the points of intersection, each of said transversel trusses consisttransverse trusses spaced apart and spaced y.from the end walls and having their ends formed integral withl the side walls, and atheir upper edges formed integral with -the roof. Each of said transverse trusses consists d lof a series of arches 168 constructed and arranged similarly to the arches 166, (except Ethat the crowns are not formed by the roof) and having their ends tied together by a fseries of inverted arches 169, similar in con-l 10p struction and arrangement to thearches 167. Suitable knee braces 170, 17() connect the fworking chamber walls and roof, and similar knee braces 171 connect the roof with the longitudinal and transverse trusses.

In Figs. 45 to 48 inclusive,.Il have illustrated a further modified form of caisson involving the usual side walls 172, 172, end walls 173, 17 3 and roof 174 formed integral therewith, and dividing the inclosure pro-V (duced by the side and end walls into a cotfer dam above and a working chamber below. ,The walls 172 and 173 are illustrated as provided with arched panels or arched trusses, but it is of course obvious that any 115 preferred construction of walls may be utilized as far as the present invention is concerned. The walls are strengthened by vertical posts 175 arranged at intervals, and eX- tending from the upper edge of the cotfer dani wall to the lower edge of the working chamber wall, being interrupted intermediate their length by the roof 174 and formed integral therewith. The lower edge of each of the posts 175 is beveled o'' to the cutting 125 edge of the respective wall. The cofl'er dam is provided with a series of transverse bulk heads, 176, andthe working chamber is provided with a series of transverse arches 177.

,one arch177 being arranged immediatelyY 13.0

ends tied together by inverted arches 152. Each arch 151 has its crown connected with the crown of its respective inverted arch 152 by a vertical post- 153. Each of the transits lower edge formed integral with the roof 147, and knee braces 154, 154, are formed integral with the roof and the said trusses at each side thereof. In addition to the 147 is further strengthened by transverse roof beams 155, 155, and longitudinal rootl beams 156, 156. Each of the longitudinal and transverse roof beams is provided at formed integral with the roof. The longitudinal beams 156 are interrupted at various points intermediate their length by thickened portions 158, each provided with an spoil shaft. At the point of the thickened portions 158, suitable knee braces 160 are formed integral with said thickened portions and with theV contiguous transverse beam Each ofthe transverse roof beams 155 at the point of intersection with the lower chord of the longitudinal truss is formed integral with said lower chord, and is furbrace 161,each transverse roof beam 155 being provided at each end with a knee brace 162 formed integral with the respective beam and with the respective side wall.

working chamber is further provided with 90 

